在SCI论文写作中，一个段落的主题句通常最适合放在一个段落的开头，这样读者很容易理解这个段落的内容，例如: The embrace of Twitter by politicians and journalists has been one of its most notable features in recent years: for both groups the use of Twitter is becoming close to a requirement. 这个主题句介绍了该段的中心思想或要点:“政客”和“记者”依赖于Twitter。本段的其余部分将集中于这两个Twitter群体的描写。此外，通过避免与主题句无关的信息，从而实现段落主题的统一。
Our typology is built on three dimensions: internality, types of participants, and the degree of effective resistance. For our study, a civil war is any armed conflict that involves (a) military action internal to the metropole, (b) the active participation of the national government, and (c) effective resistance by both sides. With these criteria, we differentiate civil wars from other types of internal violent conflicts.
Policies of privatisation should be considered as responses to several distinct pressures. First, privatisation is a response by the state to internal forces such as increasing fiscal problems (O’Connor, 1973). It provides a means of lessening the state’s fiscal responsibilities by encouraging the development of private alternatives which, theoretically at least, do not draw upon the state’s financial reserves. Second, the promotion of private sector activity is a response to pressures originating ‘outside’ the state apparatus. These include demands from people who see a large state bureaucracy as inefficient and wasteful, demands from business interests who claim that they can overcome these inefficiencies, and pressures from client groups who seek to reduce their dependency on the welfare state by having more control over the services on which they depend. Clearly, this variety of calls for privatisation means that it is not a process with a uniform outcome; there exists a correspondingly wide variety of forms of privatisation.
Evidence from industrialized countries suggests that compared with older men, older women more often experience functional impairments and activity limitations, have longer durations of disability, and spend proportionately more remaining years of life disabled.
This study was a preliminary study of high school student value changes because of the terrorist attack on the U.S. The major limitations of this study were that the student population was from California and might not truly represent all high school students in the U.S. Further, this study could not be considered a truly longitudinal study because of privacy issues that prevented the researchers from identifying all the students who returned surveys before the attack. In addition, the senior class had graduated the previous year, and a much larger freshman class entered the school. These issues not only made the samples similar, but also different in their composition. The researchers will conduct periodic studies to explore whether these value changes are permanent and continue into adulthood. We do not know what if any changes will take place in their values as they grow older, and we will continue to explore their values in our longitudinal studies of the impact of the 9/11 terrorist attacks.
In brief, the mummification process may be summarized as follows: extract, sterilize, dehydrate, perfume, seal, tag, and stock. All were done ceremoniously and with due respect to the dead body. The viscera were extracted through an incision about 10 inches long, usually made in the left side of the abdomen. Through this incision, all the “floating” contents of the abdominal cavity, namely, the stomach, the liver, the spleen, and the intestines, were removed but the kidneys were left in place. The diaphragm was then cut and the thoracic contents removed through the abdominal incision. The heart, which was considered the center of emotions and the seat of conscience, was left in place. The ancient Egyptians seem to have attached no importance to the brain, which was removed through the ethmoid bone. Following these extractions began the slow process of sterilization and dehydration of the body, accomplished by osmosis with dry natron. Resterilization of the cavities, perfuming, closing the incision, and wrapping the body with linen and with beeswax completed the process. Molten resin was used to seal the body and its wrappings, providing a barrier against insects and anaerobes.
It’s perhaps not surprising that Marshall McLuhan, the most influential communications expert of the twentieth century, was a Canadian. As a nation, we have been preoccupied with forging communication links among a sparse, widespread population. The old Canadian one-dollar bill, with its line of telephone poles receding to the distant horizon, illustrates this preoccupation. Year after year we strive to maintain a national radio and television broadcasting system in the face of foreign competition. We have been aggressive in entering the international high technology market with our telecommunications equipment.
Minois concluded his overview by suggesting that old age was something “which the early Middle Ages were decidedly not concerned about” (1989: 155). This lack of concern was not because of the absence of old people, for Minois believed that “once they had survived to their 20th year, the men [sic] … could expect to live as long as we do” (1989:149). Rather, he suggested, old people “played only a negligible social role and were dependent on the care of their families”—in effect they were marginalised by the society of the time (1989: 149).